I can't be sure (it is a nice, but very common item), but looking at some details, I would say Campagnol and Salvadore at 90%.
"Campagnol and Salvadore" (now named only "Salvadore Studio") has two lines of production: one pretty commercial (as for this bowl), focused on the craft market, and one very high end and artistic (very expensive) focused on the art galleries market.
They make them with a special tool: the steel pipe is fixed on a sliding cart.
In this way the pipe can go in a and out the oven very easly. The blow cames from a piston pushed with the foot.
This special process makes everything faster and easier, allows the production by a single worker.
It is use to small bottles, small plates, bowls, bottle stoppers and other small items.
I still work with them for some high end products. It is a nice, crazy team of skilled glassblowers